To look at a specific area of the model or block, you can either select one of the predefined views on the View tab, or use the mouse.
It is recommended that you use a three-button mouse. By holding down the middle button and moving the cursor in the graphics area, you can control the view of the model. When you move the mouse (with the middle button pressed), the trackball is displayed.
Start with the cursor in the middle of the window and press the middle mouse button, then drag the cursor up the screen. The image moves as you move the mouse.